Einstein's riddle

Autogenerated puzzle "Einstein's riddle" (Zebra Puzzle)

Aleksandr Melnikov · ru.nika.development.einsteinsriddle

Not rated yet 10K+ downloads v2.9.5 5 MB Android 7.0+ PEGI 12 · Low Maturity

Download APK 5 MB All versions

Signature matches the Google Play version Details

Watch the Einstein's riddle trailer on YouTube

At a glance

Latest version: v2.9.5 (33)
Updated: Sep 25, 2026 (13 days ago)
APK size: 5 MB
Requires: Android 7.0+ (API 24)
CPU support: Any (no native code)
Category: Puzzle (game)
Listed since: Oct 24, 2022 (at least)
Permissions: 1
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Einstein's riddle is a game by Aleksandr Melnikov in the Puzzle category, listed since at least October 2022. It has no native code, so it runs on any Android processor.

Since version 2.9.1, the minimum Android version rose from 6.0 to 7.0. It asks for 1 permission, none of them sensitive. It asks for the same permissions as version 2.9.2.

What's new in v2.9.5

Fix crash

Description

From the listing uploaded by “appupdater”.

This application - great opportunity to check your logic in solving of the famous puzzle "Einstein's riddle" or Zebra Puzzle. - Puzzles are generated randomly. - Possibility to save and load the game. - Hints about conditions violations. - Three difficulty levels Free, no ads, no In-App Purchases. The zebra puzzle is a well-known logic puzzle. It is often called Einstein's Puzzle or Einstein's Riddle because it is said to have been invented by Albert Einstein as a boy. The puzzle is also sometimes attributed to Lewis Carroll. However, there is no known evidence for Einstein's or Carroll's authorship.

Version history

3 versions are listed, going back to v2.9.1. Since v2.9.5 it requires Android 7.0+.

v2.9.5 LATEST Sep 25, 2026 5 MB TRUSTED v2.9.2 Sep 18, 2026 5 MB TRUSTED v2.9.1 Nov 15, 2025 5 MB TRUSTED

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Sep 25, 2026.
Certificate issued to “Aleksandr Melnikov” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Sep 25, 2026
Validated against Google Play Sep 25, 2026
Signed byCN=Aleksandr Melnikov, L=Saint Petersburg, C=RU
Signing certificate (SHA-1)C7:09:FD:74:88:80:56:0D:3D:D8:F9:11:76:13:46:9B:04:3C:A1:CE
File MD5f49a21f508757c9624e6eaf7c8dc5a23
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (1)

Einstein's riddle requests 1 permission, none of them sensitive.

Internal broadcast protection (app-defined) ru.nika.development.einsteinsriddle.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Required hardware & features

Basic touch input android.hardware.faketouch

Einstein's riddle APK: questions and answers

Is there a version of Einstein's riddle for older Android phones?

The current version needs Android 7.0 or later. Version 2.9.2 is the newest listed build that installs on Android 6.0 and later. Get version 2.9.2 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Einstein's riddle APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is f49a21f508757c9624e6eaf7c8dc5a23.